Systems Engineering and Electronics ›› 2019, Vol. 41 ›› Issue (8): 1844-1851.doi: 10.3969/j.issn.1001-506X.2019.08.23

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Superfast final approach strategy and control considering trajectory safety

LI Xiaochao, WANG Hua, ZHOU Wanmeng, LIU Jianghui, DING Ran   

  1. College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China
  • Online:2019-07-25 Published:2019-07-25

Abstract:

The paper studies the superfast final approach strategy and the orbit control method considering the approaching trajectory safety of spacecraft rendezvous. In the aspect of superfast final approach, in order to solve the contradiction between the superfast final approach and the passive safety of the trajectory, the concept of aiming bias point is proposed. When the rendezvous approaches, the chaser first approaches the aiming bias point with the passive safety speed, and then approaches the aiming point from the aiming bias point to the terminal aiming point. In the aspect of orbit control, the decoupled three channel fuzzy controllers are designed respectively in the superfast final approach, which can independently control all directions of the orbit. The simulation results show that under the premise of ensuring the safety of the final approach and approaching the terminal accuracy, the method can not only adapt to the constraint of the more initial speed, but also reduce the approach time to 20% of the traditional approach method.

Key words: trajectory safety, superfast final approach, aiming bias point, fuzzy control

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